#include <Wire.h>            // Include library for I2C communication
#include <RTClib.h>          // Include library for RTC module

RTC_DS1307 rtc;                  // Create an RTC object

// Constants for serial data format
char startChar = '*';  // Start delimiter
char endChar = '#';    // End delimiter

// Arrays to store time slots
char slot1[6] = "";  
char slot2[6] = "";
char slot3[6] = "";
char slot4[6] = "";

// LED pins
int led1 = 12;
int led2 = 11;
int led3 = 10;
int led4 = 9;
int button = 8;
int draw = 7;
int buzzer = 6;

// Variables to process incoming serial data
String incomingData = "";
int comma1, comma2, comma3, comma4, comma5;

void setup() 
{
  Serial.begin(9600);  // Initialize serial communication
  rtc.begin();  // Initialize RTC 

  // Set LED pins as output
  pinMode(led1, OUTPUT);
  pinMode(led2, OUTPUT);
  pinMode(led3, OUTPUT);
  pinMode(led4, OUTPUT);
  pinMode(draw, OUTPUT);
  pinMode(buzzer, OUTPUT);
  pinMode(button, INPUT);
}

void loop() 
{
  DateTime now = rtc.now();  // Get the current time from the RTC
  char currenttime[9];  // Array to store formatted current time
  sprintf(currenttime, "%02d:%02d", now.hour(), now.minute());  // Format time as HH:MM
                          
  delay(1000);  // Short delay

  Serial.println(currenttime);  // Print current time to serial
  delay(5000);  // Delay for better readability

  // Check if data is available on serial
  if (Serial.available() > 0) 
  {
    incomingData = Serial.readStringUntil(endChar);  // Read data until end character

    // Process data if it starts with the correct start character
    if (incomingData[0] == startChar) 
    {
      // Find positions of commas to split the data
      comma1 = incomingData.indexOf(',', 1);
      comma2 = incomingData.indexOf(',', comma1 + 1);
      comma3 = incomingData.indexOf(',', comma2 + 1);
      comma4 = incomingData.indexOf(',', comma3 + 1);
      comma5 = incomingData.indexOf(',', comma4 + 1);

      // Extract and store slot times
      incomingData.substring(comma1 + 1, comma2).toCharArray(slot1, 6);
      incomingData.substring(comma2 + 1, comma3).toCharArray(slot2, 6);
      incomingData.substring(comma3 + 1, comma4).toCharArray(slot3, 6);
      incomingData.substring(comma4 + 1, comma5).toCharArray(slot4, 6);

      // Print separated values for verification
      Serial.println("Separated Values:");
      Serial.print("SLOT 1: ");
      Serial.println(slot1);
      Serial.print("SLOT 2: ");
      Serial.println(slot2);
      Serial.print("SLOT 3: ");
      Serial.println(slot3);
      Serial.print("SLOT 4: ");
      Serial.println(slot4);
    }
  }

  // Check each slot time against the current time and activate LEDs if matched
  // Check for slot 1
  if (strcmp(slot1, currenttime) == 0) 
  {
    digitalWrite(led1, HIGH);  // Turn on LED 1
    delay(5000);               // Keep it on for 5 seconds
    digitalWrite(led1, LOW);   // Turn off LED 1
  }

  // Check for slot 2
  if (strcmp(slot2, currenttime) == 0) 
  {
    digitalWrite(led2, HIGH);  // Turn on LED 2
    delay(2000);               // Keep it on for 2 seconds
    digitalWrite(led2, LOW);   // Turn off LED 2
  }

  // Check for slot 3
  if (strcmp(slot3, currenttime) == 0) 
  {
    digitalWrite(led3, HIGH);  // Turn on LED 3
    delay(2000);               // Keep it on for 2 seconds
    digitalWrite(led3, LOW);   // Turn off LED 3
  }

  // Check for slot 4
  if (strcmp(slot4, currenttime) == 0) 
  {
    digitalWrite(led4, HIGH);  // Turn on LED 4
    delay(2000);               // Keep it on for 2 seconds
    digitalWrite(led4, LOW);   // Turn off LED 4
  }
  // Check if the current time matches any slot and wait for button press
  if (strcmp(slot1, currenttime) == 0 || strcmp(slot2, currenttime) == 0 || 
      strcmp(slot3, currenttime) == 0 || strcmp(slot4, currenttime) == 0) 
  {
    digitalWrite(buzzer,HIGH);
    // Wait for the button to be pressed
    if (digitalRead(button) == LOW)  // Button is pressed
    {
      digitalWrite(draw, HIGH);  // Turn on the 5th LED
      delay(3000);               // Keep it on for 3 seconds
      digitalWrite(draw, LOW);   // Turn off the 5th LED
    }
    digitalWrite(buzzer,LOW);
  }
}